INTERNATIONAL CENTRE FOR MIGRATION POLICY DEVELOPMENT (ICMPD) (2009): Regine. Regularisations in Europe. Study on practices in the area of regularisation of illegally staying third country nationals in the Member States of the EU, Vienna: Final Report, January.

— (2007): «Beyond national models: civic integration policies for immigrants in Western Europe». In West European Politics, 1, a. 30, pp. 1-22.

KASTORYANO, R. (2002): «Türken mit deutschem pass: Sociological and Political Aspects of Dual Nationality in Germany». In R. HANSEN and P. WEIL (eds.), Dual Nationality, Social Rights and Federal Citizenship in the US and Europe, Oxford: Berghahn.